CN111023255B - Anticipated control method for overshoot of intelligent heating temperature control valve - Google Patents
Anticipated control method for overshoot of intelligent heating temperature control valve Download PDFInfo
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- CN111023255B CN111023255B CN201911338536.3A CN201911338536A CN111023255B CN 111023255 B CN111023255 B CN 111023255B CN 201911338536 A CN201911338536 A CN 201911338536A CN 111023255 B CN111023255 B CN 111023255B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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Abstract
The invention discloses an anticipated control method for overshoot of an intelligent heating temperature control valve, which comprises the following steps: step 1, setting an upper temperature limit value and a lower temperature limit value, and determining an overshoot superheat value or an overshoot subcooling value through an overshoot calculation formula according to the current state of an intelligent temperature control valve and the indoor temperature change rate; step 2, judging the executed action; and 3, updating the overshoot calculation formula. The invention can maintain the indoor temperature within the set temperature range, improves the control precision, improves the comfort level of users and achieves the effect of energy conservation.
Description
Technical Field
The invention belongs to the technical field of intelligent home furnishing, and particularly relates to an expected control method for overshoot of an intelligent heating temperature control valve.
Background
The building heating system generally has two modes of floor radiation heating and heating by heating fins, and the two heat exchange modes of heat radiation and heat convection are adopted for supplying heat to rooms, so that the thermal comfort degree is higher. Meanwhile, in order to ensure the indoor temperature during heating, the heating load of the heating system needs to be adjusted. The heating system has the following regulation modes: the method comprises the following steps of water supply temperature control (adjusting the water supply temperature of heating), variable flow control (adjusting the water flow of heating), start-stop control (setting the start and stop of a temperature upper and lower limit control system), intermittent adjustment (adjusting the heating time of heating), and the like.
At present, the heating system in China enters an intelligent temperature control stage, and an intelligent temperature control valve is installed at the tail end of the heating system. The intelligent temperature control valve generally adopts a two-position start-stop control adjusting mode. Namely, under the condition of keeping the temperature and the flow of the supplied water unchanged, the opening and the closing of the valve are controlled by setting the upper and the lower temperature limits. When the indoor temperature is higher than a set upper limit value, the intelligent temperature control valve is closed, and heat supply is stopped; when the indoor temperature is lower than the set lower limit value, the intelligent temperature control valve is opened to start heat supply.
In addition, other functions of the intelligent temperature control valve are as follows: the room temperature can be automatically kept according to the preset value, and the energy-saving effect is achieved; different temperature values can be set according to different temperature requirements in different time periods, and a lower temperature value can be set when people go out, so that the energy-saving effect and the purpose are achieved; the intelligent temperature control valve can be remotely controlled through a mobile terminal such as a mobile phone; and intelligent remote control can be realized in a cloud computing mode.
When the intelligent temperature control valve adopts a two-position starting and stopping control mode which takes the indoor temperature as a single feedback parameter, the use process of the intelligent temperature control valve has the following problems:
1. when the indoor temperature reaches the upper limit value of the temperature, the indoor temperature continues to rise for a period of time due to the large heat storage performance of the heating system within a period of time after the valve is closed and the heat supply is stopped, and then the indoor temperature begins to drop, namely the indoor temperature exceeds the upper limit of the preset value.
2. When the indoor temperature reaches the lower limit value of the temperature, the indoor temperature continuously drops for a period of time due to the large heat storage performance of the heating system within a period of time after the valve is opened to start heating, and then starts to rise, namely the indoor temperature exceeds the lower limit of the preset value.
The part of the indoor temperature exceeding the upper and lower limits of the set temperature is called the overshoot of the intelligent temperature control valve. Overshoot causes the indoor temperature to deviate from the set value, which not only affects the indoor thermal comfort, but also causes the waste of partial energy. Therefore, how to control the overshoot of the intelligent temperature control valve in the heating system has important significance.
Disclosure of Invention
Aiming at the technical problems, the invention provides an expected control method for the overshoot of the intelligent temperature control valve for heating, which can improve the indoor thermal comfort and save energy.
In order to achieve the purpose, the invention adopts the technical scheme that:
the heat storage performance of the heating system is the most important factor influencing the overshoot of the intelligent temperature control valve. In addition, factors such as the water supply temperature, the water flow rate and the outdoor temperature value of the heating system also influence the overshoot. Therefore, the overshoot of the heating system is not only different for each user, but also varies from time to time throughout the heating season.
The comprehensive reflection result of the influence of the factors is the indoor temperature change rate. The overshoot after the valve state is changed is predicted by monitoring the indoor temperature change rate, and the influence of various disturbance variables is monitored. And updating the prediction control method according to the overshoot value obtained by prediction so as to ensure the accuracy of overshoot prediction.
The method for anticipating and controlling the overshoot of the intelligent temperature control valve for heating comprises the following steps:
step 1, setting an upper temperature limit value and a lower temperature limit value, and determining an overshoot superheat value or an overshoot subcooling value
Determining an overshoot superheat value or an overshoot subcooling value according to the current state of the intelligent temperature control valve and the indoor temperature change rate through an overshoot calculation formula; preferably, the overshoot calculation formula is as follows:
the intelligent temperature control valve is in an open state, and the overshoot superheat value is calculated:
overshoot superheat value of a × ebx
The first three calculations, a and b, adopt initial default data;
the intelligent temperature control valve is in a closed state, and an overshoot supercooling value is calculated:
overshoot subcooling value ═ cx + d
The first three times of calculation, wherein c and d adopt initial default data;
wherein a, b, c and d are formula coefficients, e is a natural constant, and x is the indoor temperature change rate.
Step 2, judging the executed action
When the valve is in an open state: when the current indoor temperature is more than or equal to (the upper limit value of the temperature-superheat value), pre-adjusting, closing the valve in advance, and then increasing and then decreasing the indoor temperature; when the current indoor temperature is less than (upper limit value-superheat value), the operation is not performed;
when the valve is in a closed state: when the current indoor temperature is less than or equal to (the lower temperature limit value-the supercooling value), pre-adjusting, opening the valve in advance, and then increasing the indoor temperature after first decreasing; when the current indoor temperature is > (lower temperature limit value-supercooling value), the operation is not performed;
And after the pre-adjusting action is executed, recording the overheating value or the supercooling value of the corresponding overshoot at the current indoor temperature change rate. And when the overshoot superheat value or the overshoot supercooling value has three or more historical data, fitting and updating the overshoot superheat value or the overshoot supercooling value calculation formula according to the corresponding overshoot superheat value or the overshoot supercooling value under the latest three groups of indoor temperature change rates. At this point, the logic of preconditioning is complete.
Preferably, in order to make the formula fitting more accurate, after recording the overheating value or the overcooling value of the overshoot for three or more times, the recorded three actual operation data are used for fitting the overshoot overheating value or the overcooling value calculation formula, and the formula coefficient values of a, b or c, d in the overshoot calculation formula are updated. Namely, updating the coefficient values of a and b in the overshoot superheat value calculation formula in a formula fitting mode by adopting the latest three actual overshoot superheat values and the corresponding three temperature rise rate values; and updating the coefficient values of c and d in the overshoot supercooling value calculation formula by adopting the latest three actual overshoot supercooling values and the corresponding three temperature drop rate values in a formula fitting mode.
Preferably, each time the temperature rise or temperature drop process after the pre-regulation action is executed, the overshoot supercooling value or the overshoot supercooling value of one round is recorded, and the overshoot calculation formula is updated.
The invention has the following beneficial effects: the intelligent temperature control valve adopts an expected control method, and when the intelligent temperature control valve is in an opening state, the indoor temperature continuously rises; when the indoor temperature does not reach the upper temperature limit value, the temperature control valve is controlled to be closed in advance; after the indoor temperature continues to rise to the upper temperature limit, the indoor temperature starts to fall.
When the intelligent temperature control valve is in a closed state, the indoor temperature is continuously reduced; when the indoor temperature does not reach the lower temperature limit value, the temperature control valve is controlled to be opened in advance; after the indoor temperature continues to decrease to the lower temperature limit, the indoor temperature starts to increase.
The anticipatory control is to control the thermostatic valve to act in advance when the indoor temperature has not reached the upper and lower limit values. The indoor temperature is maintained within the set temperature range, the control precision is improved, the comfort level of a user is improved, and the energy-saving effect is achieved.
Drawings
FIG. 1 is a diagram comparing desired control and two-position start-stop control for an embodiment of the present invention.
FIG. 2 is a flow chart of a contemplated control method of an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following embodiments and accompanying drawings.
When the intelligent temperature control valve adopts two-position start-stop control, the heat delay can cause overheating or overcooling of a room, so that discomfort and energy waste are caused. The expected control is realized by adjusting the time for starting and stopping heating of the system, and the control valve is operated in advance before the room temperature reaches the set value of the user. The method not only enables the room temperature to be basically maintained within the temperature range set by the start-stop control, improves the control precision, but also achieves the effect of energy conservation. The two control modes are schematically shown in the following fig. 1. In the figure, 1 — the valve closing time point under expected control; 2-valve closing time point under the control of two-position start and stop; 3-valve opening time point under expected control; 4-valve opening time point under two-position start-stop control; 5-indoor temperature superheat value; 6-indoor temperature supercooling value.
The key problem of anticipating control is determining the advance of valve opening or closing, which in turn controls valve advance. That is, the superheat and subcooling values for the overshoot after closing and opening the valve at the current set temperature are determined. Furthermore, when the indoor temperature is more than or equal to (upper limit value of temperature-superheat value), closing the valve in advance; when the indoor temperature is less than or equal to (the lower limit value of the temperature-the supercooling value), the valve is opened in advance.
The heat storage performance of the heating system is the most important factor influencing the overshoot of the intelligent temperature control valve. In addition, factors such as the water supply temperature, the water flow rate and the outdoor temperature value of the heating system also influence the overshoot. Therefore, the overshoot of the heating system is not only different for each user, but also varies from time to time throughout the heating season.
However, the combined reflection of the effects of the above factors is the rate of change of the indoor temperature. The overshoot after the valve state is changed can be predicted by monitoring the change data, and the influence of various disturbance variables is monitored. Meanwhile, the latest actual overshoot value is adopted to update the prediction method so as to ensure the accuracy of overshoot prediction.
A flow chart of a contemplated control method is shown in fig. 2, with the steps of:
1) determining overshoot superheat or subcooling
And determining the overshoot according to the current state of the intelligent temperature control valve and the indoor temperature change rate, wherein the calculation formula is as follows.
Overshoot superheat value calculation formula:
overshoot superheat value of a × ebx
a. b-formula coefficients, the initial default values are 0.0500 and 1.50 respectively;
e-natural constant, about 2.718;
x-indoor temperature rate of change.
The method is suitable for the intelligent temperature control valve in an opening state, the first three times of calculation are carried out, and the initial default data are adopted for a and b.
Overshoot superheat value calculation formula:
overshoot subcooling value ═ ax + b
a. b-formula coefficients, initial default values are 0.300, 0.100 respectively;
x-indoor temperature rate of change.
The method is suitable for the intelligent temperature control valve in a closed state, the first three times of calculation are carried out, and the a and the b adopt initial default data.
2) Determining an action to perform
When the valve is in an open state: when the current indoor temperature is more than or equal to (the upper limit value of the temperature-superheat value), pre-adjusting, closing the valve in advance, and then increasing and then decreasing the indoor temperature; when the current indoor temperature is less than (upper temperature limit value-superheat value), no action is performed.
When the valve is in a closed state: when the current indoor temperature is less than or equal to (the lower temperature limit value-the supercooling value), pre-adjusting, opening the valve in advance, and then increasing the indoor temperature after first decreasing; when the current indoor temperature is > (lower temperature limit value-supercooling value), no operation is performed.
3) Updating overshoot data
And after the pre-adjusting action is executed, recording the overheating value or the supercooling value of the corresponding overshoot at the current indoor temperature change rate. And when the superheat value or the supercooling value of the overshoot has three or more historical data, fitting and updating the calculation formula of the superheat value or the supercooling value of the overshoot according to the corresponding superheat value or supercooling value under the latest three groups of indoor temperature change rates. At this point, the logic of preconditioning is complete.
And recording the overshoot superheat value or the overshoot subcooling value of one round in the temperature rise or temperature drop process after each pre-regulation action is executed, and updating the overshoot calculation formula.
When the intelligent temperature control valve adopts an expected control method, the working effect is as follows:
when the intelligent temperature control valve is in an open state, the indoor temperature continuously rises; when the indoor temperature does not reach the upper temperature limit value, the temperature control valve is controlled to be closed in advance; after the indoor temperature continues to rise to the upper temperature limit, the indoor temperature starts to fall.
When the intelligent temperature control valve is in a closed state, the indoor temperature is continuously reduced; when the indoor temperature does not reach the lower temperature limit value, the temperature control valve is controlled to be opened in advance; after the indoor temperature continues to decrease to the lower temperature limit, the indoor temperature starts to increase.
The anticipatory control is to control the thermostatic valve to act in advance when the indoor temperature has not reached the upper and lower limit values. The indoor temperature is maintained within the set temperature range, the control precision is improved, the comfort level of a user is improved, and the energy-saving effect is achieved.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (2)
1. The method for anticipating and controlling the overshoot of the intelligent temperature control valve for heating is characterized by comprising the following steps:
step 1, setting an upper temperature limit value and a lower temperature limit value, and determining an overshoot superheat value or an overshoot subcooling value through an overshoot calculation formula according to the current state of an intelligent temperature control valve and the indoor temperature change rate;
the calculation formula of the overshoot is that the intelligent temperature control valve is in an open state, and the overshoot superheat value is calculated:
overshoot superheat value = a × ebx
The intelligent temperature control valve is in a closed state, and an overshoot supercooling value is calculated:
overshoot subcooling value =cx+d
a、b、c、dIn order to be the coefficients of the formula,eis a natural constant and is a natural constant,xis the rate of change of the indoor temperature;
step 2, judging the executed action:
when the valve is in an opening state and the current indoor temperature is more than or equal to (the upper limit value of the temperature-superheat value), pre-adjusting, closing the valve in advance, and then increasing and then decreasing the indoor temperature; when the current indoor temperature is less than (upper limit value-superheat value), the operation is not performed;
when the valve is in a closed state and the current indoor temperature is less than or equal to (the lower temperature limit value-the supercooling value), pre-adjusting, opening the valve in advance, and then increasing the indoor temperature after first decreasing; when the current indoor temperature is > (lower temperature limit value-supercooling value), the operation is not performed;
and 3, updating an overshoot calculation formula:
after the pre-adjustment action is executed, the overshoot superheat value or the overshoot supercooling value under the indoor temperature change rate obtained by actual operation is adopted, and the overshoot superheat value or the overshoot supercooling value calculation formula is fitted again to obtaina、bOrc、dThe value of the formula coefficient of (a);
the first three times of calculation are carried out,a、borc、dAdopting initial default data;
after recording the overheating value or the overcooling value of the overshoot for three times or more, fitting the overshoot calculation formula by using three actual operation data of the recorded values, and updating the overshoot calculation formulaa、bOrc、dThe value of the formula coefficient of (a);
namely, the latest three actual overshoot superheat values and the corresponding three temperature rise rate values are adopted, and the overshoot superheat value calculation formula is updated in a formula fitting modeIn the formulaa、bA coefficient value of (d); updating the overshoot supercooling value calculation formula by adopting the latest three actual overshoot supercooling values and the corresponding three temperature reduction rate values in a formula fitting modec、dCoefficient value of (c).
2. The method for anticipatory control of overshoot of an intelligent temperature controlled valve for heating according to claim 1, characterized in that:
and recording the overshoot superheat value or the overshoot subcooling value of one round in the temperature rise or temperature drop process after each pre-regulation action is executed, and updating the overshoot calculation formula.
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